regarding ms in us

presently i am doing engineering in ece from mumbai university,and i want to do ms in computer science from us in some good university,but i took drop of two years after 12th for preparation of entrance exam and unfortunately i dint cleared entrance exam,will drop of two years after my 12th std affect my admission in universities in us???

Having a break of few years never affects a study or job in USA, as long as you articulate your break in your statement of purpose. Focus on a good SOP and good GRE score.

so should i mention my drop of 2 years explaining reason for drop in SOP or i should not???

Yes, you should mention it in SOP and explain it why…You should be honest and put everything on paper. Do NOT try to hide anything, it can get you in trouble later.